/*
 * The contents of this web application are subject to the Mozilla Public License Version 
 * 1.1 (the "License"); you may not use this web application except in compliance with 
 * the License. You may obtain a copy of the License at http://www.mozilla.org/MPL/.
 * 
 * Software distributed under the License is distributed on an "AS IS" basis, 
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License 
 * for the specific language governing rights and limitations under the License.
 * 
 * The Original Code is owned by and the Initial Developer of the Original Code is 
 * Composite A/S (Danish business reg.no. 21744409). All Rights Reserved
 * 
 * Section 11 of the License is EXPRESSLY amended to include a provision stating 
 * that any dispute, including but not limited to disputes related to the enforcement 
 * of the License, to which Composite A/S as owner of the Original Code, as Initial 
 * Developer or in any other role, becomes a part to shall be governed by Danish law 
 * and be initiated before the Copenhagen City Court ("K�benhavns Byret")            
 */

using System;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;
using System.Xml.Linq;
using Composite.Core.Types;


namespace Composite.Core.Serialization
{
    internal sealed class SystemSerializableValueXmlSerializer : IValueXmlSerializer
    {
        public bool TrySerialize(Type objectToSerializeType, object objectToSerialize, IXmlSerializer xmlSerializer, out XElement serializedObject)
        {
            if (objectToSerializeType == null) throw new ArgumentNullException("objectToSerializeType");

            serializedObject = null;

            int attributeCount = objectToSerializeType.GetCustomAttributes(typeof(SerializableAttribute), false).Length;

            if (attributeCount > 0) 
            {
                serializedObject = new XElement("Serializable");

                if (objectToSerialize != null)
                {
                    using (MemoryStream ms = new MemoryStream())
                    {
                        BinaryFormatter binaryFormatter = new BinaryFormatter();
                        binaryFormatter.Serialize(ms, objectToSerialize);

                        ms.Seek(0, SeekOrigin.Begin);

                        using (BinaryReader br = new BinaryReader(ms))
                        {
                            byte[] bytes = br.ReadBytes((int)ms.Length);

                            string result = Convert.ToBase64String(bytes);

                            serializedObject.Add(new XAttribute("value", result));
                        }
                    }
                }
                else
                {
                    serializedObject.Add(new XAttribute("type", TypeManager.SerializeType(objectToSerializeType)));
                }

                return true;
            }
            else
            {
                return false;
            }
        }



        public bool TryDeserialize(XElement serializedObject, IXmlSerializer xmlSerializer, out object deserializedObject)
        {
            deserializedObject = null;

            if (serializedObject == null) throw new ArgumentNullException("serializedObject");
            if (serializedObject.Name.LocalName != "Serializable") return false;

            

            XAttribute typeAttribute = serializedObject.Attribute("type");
            XAttribute valueAttribute = serializedObject.Attribute("value");
            
            if ((valueAttribute == null) && (typeAttribute != null))
            {
                Type type = TypeManager.GetType(typeAttribute.Value);
                int attributeCount = type.GetCustomAttributes(typeof(SerializableAttribute), false).Length;

                if (attributeCount > 0)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            else if ((valueAttribute != null) && (typeAttribute == null))
            {
                byte[] bytes = Convert.FromBase64String(valueAttribute.Value);
                using (MemoryStream ms = new MemoryStream(bytes))
                {
                    BinaryFormatter binaryFormatter = new BinaryFormatter();

                    deserializedObject = binaryFormatter.Deserialize(ms);

                    return true;
                }
            }
            else
            {
                return false;
            }
        }
    }
}
